PEA FAMILY 489 



long; raceme lax, 4-15-flowered; calyx with scattered short black hairs; tube 

 campanulate, 2 mm. long; teeth subulate, 2 mm. long; corolla cream-colored or 

 white (according to Gray sometimes purple), about 8 mm. long; pod ovoid, gla- 

 brous, about 2 cm. long, 1.5 cm. wide. A. Wardii A. Gray. Dry hills: Utah. 

 Submont. Mont. Je-Au. 



14. P. subcinerea (A. Gray) Rydb. Cespitose perennial; stems erect, 2-4 

 dm. high, cinereous-canescent; leaflets 15-21, linear or oblong, 6-10 mm. long, 

 retuse, cinereous on both sides; raceme short; calyx cinereous; tube 3 mm. long; 

 teeth subulate, 1 mm. long or less; corolla greenish, with purple tip, 6 mm. long; 

 pod ovoid-globose, puberulent, 1.5-2 cm. long, acute. A. subcinereus A. Grayi 

 Dry places: Ariz. s Utah. L. Son. My-Je. 



15. P. Candolleana H.B.K. Cespitose perennial; stems 1-3 dm. high, 

 branched, strigose, erect or spreading; leaflets 11-15, oblong, 6-15 mm. long, 

 obtuse, truncate, or retuse at the apex, grayish strigose or hirsute; raceme short; 

 calyx strigose; tube 2 mm. long; teeth subulate, nearly 2 mm. long; corolla ochro- 

 leucous, 6-7 mm. long; pod ellipsoid, 2-2.5 cm. long, 1-1.5 cm. broad, sparingly 

 pubescent, not mottled. A. triflorus A. Gray, not D.C. Hills and mountains: 

 w Tex. Colo. Calif. n Mex. Son. Ap Je. 



16. P. cerussata (Sheld.) Rydb. Perennial; stems 2-3 dm. high, erect- 

 spreading, striate, sparingly strigose; leaflets 11-17, oblong to obovate, emargin- 

 ate, 5-12 mm. long, pilose-strigose on both sides, or glabrate above; racemes lax, 

 3-7-flowered; calyx strigose; tube and the subulate teeth each 2 mm. long; 

 corolla ochroleucous, tipped with purple, 8-9 mm. long; pod ellipsoid, 12-16 mm. 

 long, finely pubescent. A . cerussatus Sheld. Canons: Colo. Submont. My-Je. 



17. P. serpens (M. E. Jones) Rydb. Perennial, with a thick woody root 

 and cespitose caudex; stems decumbent or ascending, 3-20 cm. long; leaflets 

 11-15, crowded, elliptic or oval, folded, 4-6 mm. long, grayish strigose; racemes 

 2-6-flowered; calyx strigose-canescent; tube 2 mm. long; teeth triangular-subu- 

 late, 1 mm. long; corolla greenish purple, 7 mm. long; pod broadly ellipsoid, 

 about 15 mm. long, 1 mm. broad, mottled, glabrous. A. serpens M. E. Jones. 

 Dry mountains: Utah. Submont. Mont. Jl. 



18. P. Silerana (M. E. Jones) Rydb. Perennial; stems many, decumbent, 

 5-8 dm. long, hirsutulous; leaflets about 9 pairs, 1-1.5 cm. long, oblanceolate, 

 obovate or oblong, notched at the apex, hirsutulous; flowers subcapitate; calyx- 

 teeth subulate; corolla 7 mm. long, light yellow; keel dark-tipped; pods purple- 

 spotted, sessile, short-pubescent, 12-15 mm. long. A. Sileranus M. E. Jones. 

 Among brush, on hillsides: Utah. Submont. Mont. Je-Jl. 



19. P. Bodinii (Sheld.) Rydb. Perennial, scarcely cespitose; stems slender, 

 glabrous, 3-6 dm. high, decumbent, branched; leaflets 11-17, oval to lanceolate, 

 acute, 7-18 mm. long, glabrous or sparingly strigose beneath; raceme lax, 4-16- 

 flowered; calyx strigose, with black hairs; tube 3 mm. long; teeth subulate, 2 mm. 

 long; corolla purple, 10-12 mm. long; pod ovoid, black-strigose, 8 mm. long, 4 

 mm. wide. A. Bodinii Sheld. Meadows: Neb. Wyo. Colo. Jl-Au. 



20. P. leptalea (A. Gray) Rydb. Cespitose perennial, with a rootstock; 

 stems ascending, 1-3 dm. high, branched; leaflets 15-21, lanceolate to linear- 

 lanceolate, acute, 5-10 mm. long, glabrous or sparingly strigose; racemes 1-4- 

 flowered; calyx black-strigose; tube 2.5 mm. long; teeth subulate, 2-2.5 mm- 

 long; corolla white, tipped with purplish, about 1 cm. long; legume oblong- 

 elliptic, strigillose with black hairs, 1 cm. long, 4mm. broad. A. leptakus A. 

 Gray. P. pauciflora Nutt., not Pers. Mountains: Colo. Submont. Mont. 

 Jl-Au. 



21. P. microcystis (A. Gray) Rydb. Perennial, with a taproot and cespi- 

 tose caudex; stems numerous, ascending or procumbent, canescent-strigose; 

 leaflets 9-13, oblong or lance-oblong, obtuse, strigose on both sides, or glabrate 

 above; raceme lax; calyx strigose; tube and the subulate teeth each 1.5 mm. 

 long; corolla violet or nearly white, 6-7 mm. long; legume globose-obovoid, 6-8 

 mm. long, densely canescent. A. microcystis A. Gray. Hillsides and sandy 

 shores: B.C. Mont. Wash. Plain Submont. Jl-Au. 



